Question 220585
You can use upper case 6,"^" to indicate an exponent

1.(9x^3 - 4 + x^2 + 8)-(7x^3 - 3x + 7)
Remove the brackets
Remember, if there is a neg outside the brackets you change the signs
9x^3 - 4 + x^2 + 8 - 7x^3 + 3x - 7
Group like terms
9x^3 - 7x^3 + x^2 + 3x - 4 + 8 - 7
results
2x^3 + x^2 + 3x - 3